The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 10, 2004
Filed:
Jul. 12, 2002
Applicant:
Inventors:
Assignee:
TDK Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F 1/34 ; H01F 1/704 ;
U.S. Cl.
CPC ...
H01F 1/34 ; H01F 1/704 ;
Abstract
An Mn—Zn based ferrite composition having a main component comprised of Fe O : 51.5 to 54.5 mol %, ZnO: 19.0 to 27.0 mol % and the rest of substantially MnO and a first sub component comprised of 0.002 to 0.040 wt % of SiO , 0.003 to 0.045 wt % of CaO and 0.010 wt % or less of P with respect to 100 wt % of the main component. In a magnetic core for a transformer comprised of this composition, the THD of the transformer becomes −84 dB or less in a broad frequency band, so it can be preferably used as a magnetic core, for example, for an xDSL modem transformer.